Answer:
Hiiiiiiii ! :) so here's a step by step explanation okay, starting with the first step below. Hope it helps you ! :) :)
Explanation:
Begin with the volume of water:
V = πr²×h = π×(9m)²×2.5m = 636.17m³
Weight of water = 636.17×10³kg
G force on water = 9.8m/s²×636.17×10³kg = 6,234.49kN
Water's center of gravity is 2.75m below edge of pool.
(2.5m/2 = 1.25m, 4m - 1.25m = 2.75m)
Work = force × distance = 6,234.49kN × 2.75m = 17,144.85
Hope i helped. <3